Grinding-mill



A. E. JACOBSON.

GRINDING MILL.

APPLICATION FILED APR. 7. 1919.

Patentd Apr. 12, 1921.

2 SHEETSSHEET I.

//Y vE/y TOE JACOBSON. GRINDING MILL. APPLICATION FILED APR- 7. 1919.

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Patented Apr. 12, 1921.

2 SHEETS-SHEET 2.

J Y m3 0 7o w w 7 f f H A UNlTE DSTATES PATENT OFFICE.

AXEL E. JAC OI BSON, 0F MINNEAPOLIS, MINNESOTA.

GRINDING-MILL.

To all whom it may concern:

Be it known that I, Axnr. E. J ACOBSON, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Grinding- Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as I will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in mills for grinding grain, feed and the like, and has for its object to provide therefor a highly eflicient grinding surface.

To the above end, the invention consists of the novel devices and combination of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings Figure 1 is a view principall in vertical section taken on the line 1-1 0 Fig. 2, and illustrating a grindin millhaving the invention incorporated t erein;

Fig. 2 is a transverse section taken on the line 2-2 of Fig. 1;

Fig. 3 is a transverse section taken on line 3-3 of Fig. 1;

Fig. 4 is a perspective view of the grinding and screening cylinder, removed from the mill; i

Fig. 5 is A enlarged scale, showing the inner face of the grinding and screening cylinder;

Fig. 6 is a detail view in section taken on the line 6-6 of Fig. 5; and

Fig. 7 is a detail view in section taken on the irregular line 7 -7 of Fig. 5.

The numeral 8 indicates a base having converging the sides and its top is provided with a segmental depression 9which extends transversely and centrally between the ends of said base. This de ression 9 is also further centrally depresse to afford a concentric segmental seat I I verging sides of the base 8. A cylnudrlcal housing 11, having an open bottom, is supported in the depression 9 by forming therewith outturned segmental flanges 12 which rest on said depression. The housing 11 is further supported from the base 8 by integrally forming with the ends of said housing, horizontally outturned flanges 13, lo-

its top section i is bolted, a

a fragmentary detail view, on an 10 which extends to the con- Specification ofLetters Patent. Patented Apr. 12, 1921.

-Application filed April 7, 1919. Serial No. 288,106.

cated above the flanges 11, supported on the top of the base 8, outward of the depression 9, and rigidly bolted thereto.

Cast pockets 14 having open tops and converging side walls are rigidly secured by bolting the same to the oblique walls of the base 8. The open tops of the pockets 14 extend into the open bottom of the housing 11 with their upper edges located the same distance from the axis of the housing as the inner face of said housing.

providing said housing with outturned radial flanges 15, which overlap said pockets and are bolted thereto. In the bottoms of the pockets 14 are cover equipped hand holes 16.

Formed in the housing 11, at the right side thereof, is an eccentrically located segmental air chamber 17 which is open throughout its entire length, to the interior of the housing 11 and extends fro-m the pockets 14 over and above said housing. I In the top of the housing 11 is a displaceable section or cover 18, which extends the full length thereof and is detachably secured in position by nut equipped bolts 19, passed through alined bores formed in outturned radial flanges 20 integrally formed with said housing 11 and 18. Formed in the housing section 18, at the top of the air chamber 17, is a flanged discharge opening 21 to which discharge pipe 22, leading to a storage bin or the like, not shown.

Said pockets '14. are further secured to the' housing 11 by A power shaft 23'is loosely extended axigrain intake eye 26.

lower one half of the eye-26 and its upper end portions extending to the top of said hou Tot e upright members of the guard 27 is secured a horizontally disposed oblique! deflecting board 28 which overlies the ,eye 26. A bracket 29 is bolted to the displaceable section 18 of the housing 11 and is provided with a vertical discharge opening 30, located partly over and partly outward of the deflecting board 28. The flanged lower end of the grain supply pipe 31 rests upon the bracket 29 and is bolted thereto, and leads from a hopper or other suitable source of supply, not shown. I

Keyed to the shaft 23, for rotation therewith, in the housing 11, are two axially spaced spiders 32 in the form of annular heaters, each of which comprises a multi* plicity of rectangular sheet metal plates 34, held between and laterally spaced by sheet metal plates 35. These beater and spacing plates of each set are rigidly connected by bolts or rivets 36 and, it will be noted, that radially outward to afford the two outer plates 35 are somewhat thicker than the inner of said plates togive the required rigidity to the beaters. It will also 7 be noted that the outer ends of the beater plates 34 extend outward of the spacing plates 35 to afford a plurality of fingers having sharp cutting corners for cooperation with the improved grinding surface, as will presently appear. The several sets of heaters are pivota'lly secured to the respective rods 33 by f0 therein, near their inner ends, bores through which said rods project. Each beater is held against axial movement on the respective rod 33 by the adjacent spider"32 and a cotter pin 33. y

The improved grinding surface, heretofore referred to and with which the heaters cooperate, to produce the grinding action of the mill, is formed with a cylinder 37 mounted in the housing 11 and provided with a screening surface, as will hereinafter appear. This cylinder 37 extends the full width of the housing 11 and comprises a top section 38, a bottom section 39 and two side sections 40, The top cylinder section 38 bears against the inner face of the t section 18 of the housing 11 and the bottom section 39 rests upon a segmental plate 41 supported in the seat 10. d

To hold the several-sections of the cylinder 37 in the proper positions in the housing 11 and against circumferential movement therein, the ends thereof are bent anchoring flanges 42 which extend in seats 43. Theseats 43 ment. These loops 46 have a concavo-convex formation, in respect to the direction of rotation of the heaters, to afford, on their inner or concave faces, two sharp cutting edges 47. Either of these cutting edges 47 may be used by changing the direction of rotation of the shaft '23. This grinding surface covers the entire surface of the lower cylinder section 39 and only about one half of the width of the cylinder sections 38 and 40.

The other one half of the width of the cylinder sections 38 and 40 are perforated to afford a screen 48 which separates the main housing 11 "from the air chamber 17. The openings in the cylinder 37 produced by the formation. of the loops 46 and which afl'ord the grinding surface of the mill are closed in the sections 38 and 40 by the shell Operation.

The operation of the grinding mill'may be briefly discribed as follows, to wit The shaft 23 is driven at a very hi h number of revolutions per minute and t e suction produced by the spiders '32 and heaters, draws grain, precipitated from the spout-31, through'the eye 26 and into the housing 11, as indicated by'arrows marked on Fig. 1. Y

The grain, as the same islield against the cutting edges 47, nearest the approach of the heaters, which are held outward under centrifugal force, is caught by said heaters, crushed of cut and driven through the loops 4:6. From the housing 11 the ground feed is forced through the screen 48 into champroduced by the spiders feed, a relatively heavy object caught in either of said pockets will settle therein. The contents 0 these pockets 14 may be for the flanges 42 on the top section 38 andemptied from time to time by opening the .lh and holes 16.

The improved grinding surface of the mill will keep sharp throughout the life thereof and is operative in either direction of rotation of the shaft 23. Owing to the width of the loops 46, the improved grinding surface will last a long time.

It is, of course, understood that the-sections of the cylinder '37 may be independently replaced when worn out. In place of forming the grinding and screening surfaces of each section with an integral plate, said plate may consist of two members, the one containing the grinding surface and the other, the screening surface, so that said members may be independently replaced when Worn out or for other purposes.

WVhat I claim is:

1. The combination with a housing, of a segmental plate in the housing having cut and pressed therefrom loops which constitute a grinding surface thereon, both ends of the loops being integral with the plate, the under faces of said loops being spaced above the upper face of the plate, and revoluble beaters mounted in the housing for cooperation with said grinding surface and arranged to move transversely over said loops.

2. The combination with a housing having a closed segmental surface, of a segmental plate directly and removably supported on said surface and having cut and pressed,

ers mounted in the housing for cooperation with said grinding surface and arranged to .move transversely over said loops.

3. The combination with a housing, of a segmental plate in the housing tute a grinding surface thereon, both ends of the loops being integral with the plate, the under faces of said loops being spaced above the upper face of the plate, said loops being concavo-convex in cross section, and revoluble beaters mounted in the housing for cooperation with said grinding surface and arranged to move transversely over said loops. i

In testimony whereof I aflix my signature in presence of two witnesses.

AXEL E. JACO-BSON.

Witnesses:

E. S. SAGKETT,

HARRY D. KILGORE.

having cut and pressed therefrom lOlOPS which consti- 

